Não informado. (2001). The Bell System Technical Journal. American Telephone and Telegraph Company.
Lua i Stíl Chicago (17ú heag.)Não informado. The Bell System Technical Journal. New York: American Telephone and Telegraph Company, 2001.
Lua MLA (8ú heag.)Não informado. The Bell System Technical Journal. American Telephone and Telegraph Company, 2001.
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